[Dovecot] can I share IMAP folders for multiple user

Hi, Dear all, Just a bit curious, could I configure dovecot for two users share the access to certain IMAP folders in the mailbox? I searched the list archive and only found http://dovecot.org/list/dovecot/2004-April/003236.html and http://dovecot.org/list/dovecot/2004-April/003168.html, but I am not sure is this the same thing that I want and where could I find more details?

Wish you a nice day!

Hitao