[Zope] ftp to zope

i have linux a box with zope 2.4 on it. I have a fold directory /f1/f2 user u0 has root rigths. user u2 can only access to f2. The problem is that: u0 can use ws-ftp to ftp files to the zope, but u2 can not. becuase everytime ftp will try to connect to /. how can i let zope to do that: when user u2 try to ftp someting to zope the default directory will be /f1/f2? Thanks