[mew-int 3113] available folders in IMAP

Hi,

how can I limit the number of remote folders shown when using IMAP 
from mew?

When connecting to my IMAP account at work, the complete content of 
my home directory appears in mew-imap-folder-alist, but in reality 
only the remote directory "Mail" contains e-mail.  Is there a way to 
limit the visible folders to "%inbox" and "%Mail"?

Perhaps related: can someone explain the use of the variable 
"mew-imap-prefix-list" to me?  I'm having some trouble understanding 
the documentation.

kind regards,

Thomas Danckaert