Hide tree in one service

[Giuseppe Ravasio]

Hi,

on my imap server I've a shared folders setup, for example:

Shared_one/
Shared_one/Sub1
Shared_one/Sub2
Shared_two/Sub1
Shared_two/Sub2
user/*

I would like to setup a different imap service on a different imap port 
where users can see only user subtree (alias they can only see their inbox)

There is a way to setup such a service?

Thanks
Beppe