how avoid logspam "pam_unix(samba:session): session closed for user nobody" ?

hello,

we run samba on our server for serving iso-images to proxmox hosts, and 
decreased echo_interval from 60 to 10 , for faster failure on hung mount 
condition, when iso-server is down for maintenance.

this is how the corresponding cifs mount on proxmox side looks like:

//iso-images/iso-ablage on /mnt/pve/iso-images type cifs 
(rw,relatime,vers=3.1.1,cache=strict,upcall_target=app,\
username=guest,uid=0,noforceuid,gid=0,noforcegid,addr=10.0.0.10,file_mode=0755,dir_mode=0755,soft,nounix,\
mapposix,rsize=4194304,wsize=4194304,bsize=1048576,retrans=1,echo_interval=10,actimeo=1,closetimeo=1)

the corresponding smb.conf entry looks like this:

[iso-ablage]
     browsable=yes
     public=yes
     writeable=no
     guest ok = yes
     guest only = yes
     force user = nobody
     path=/mnt/zfspool/iso-images

the problem is, that we have way to much spam in iso-images server log 
like this:

#journalctl -u smbd -f
Feb 05 11:48:56 iso-images smbd[543100]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:48:57 iso-images smbd[543103]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:48:59 iso-images smbd[543181]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:01 iso-images smbd[543182]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:03 iso-images smbd[543183]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:06 iso-images smbd[543184]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:07 iso-images smbd[543185]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:08 iso-images smbd[543186]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:11 iso-images smbd[543187]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:12 iso-images smbd[543188]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:15 iso-images smbd[543189]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:16 iso-images smbd[543200]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:18 iso-images smbd[543217]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:20 iso-images smbd[543218]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:22 iso-images smbd[543219]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:25 iso-images smbd[543220]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:26 iso-images smbd[543221]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:29 iso-images smbd[543225]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:31 iso-images smbd[543226]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:33 iso-images smbd[543227]: pam_unix(samba:session): 
session closed for user nobody
Feb 05 11:49:35 iso-images smbd[543228]: pam_unix(samba:session): 
session closed for user nobody

log level = 0 does not seem to help

samba version is 4.22.8+dfsg-0+deb13u1 from trixie-backports (debian)

how can we get rid of this logspam ?

regards
Roland
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