[Zope] Redirect FTP access on a role basis

Is it possible to redirect FTP access to subfolders depending on user's role? If yes, how can I do that? I would like to have ftp://www.mysite.com connect to the graphics folder "/gfx", if an account with a "Designer role" connects to the server in order to upload/exchange graphics. His account is only permitted to exchange graphics anyway (through web interface or FTP), so why should I show him the root tree? tia, Danny P.S.: Yes, I know that I can set _permissions_ for FTP access.