[Zope] Easy one?

Hi! I try to make a tree view of folders and files in a document-folder. Thats not to hard, but .... Each user on the site has their own root folder, and can access only to that one not the other users folders. Now - making the tree the normal way displays all the root folders - how can I avoid this and just display the folder that belong to the authenticated user? (folder id == AUTHENTICATED_USER) ? Thanks Sture Lygren