[Dovecot] virtual mailboxes folder structure

[Marco Cusano]

Hi, I am trying to find a way to list my virtual mailboxes hiding the 
namespace prefix into my imap client.
 
Fore example now my “All” mailbox is listed under virtual/ as:
 
Inbox
Sent
Drafts
Spam
Trash    
virtual    
    All
 
I would like to list as this:
 
Inbox
Sent
Drafts
Spam
Trash      
    All
 
This is my 10-mail.conf: http://pastebin.com/DumEbbmy
and this is my 15-mailboxes.conf: http://pastebin.com/QFzWGzyC
 
I thought that the list = children paramenter would do but it did 
not.
 
Thank you