[Samba] prevent normal users from getting userlist

[Florian Effenberger]

Hello,

I run Samba 3.0.20a with Windows XP Professional SP2 client. I found out
that when a normal (i.e. not domain administrator) user runs the old
Windows NT 4 user client, it can retrieve the whole list of usernames
and fullnames.

Can that be prohibited in any way?

Thanks
Florian