wuftpd home directory

I have the following entry in the /etc/passwd:

ftptest1:x:67775:80:ftp test
account:/usr/local/documents/ftptest1/./:/bin/false

Then when echo time login in with ftp, I got message
saying "No home directory, home=/",  why does this
happen? I actually want ftptest1's home directory to be
/usr/local/documents/ftptest1.  

Also, after I login, I would like to restrict ftptest1
to only use its own home directory, but it seems that I
still can switch to other directories. why?  Is there
any other files I need to configure ? 

Thanks a lot for advice!