[Samba] workgroup filter

[Martin]

Hi,

I have only just started using Samba and I'm trying to do the following:

There's a Linux computer that's running Samba. It's the local master and the WINS server for our network. All computers are on this network, using a workgroup. 
In a couple of days 5 computers will be added to this network. What I want is for those 5 new computers to be a member of the network but not to be able to browse it. The 5 computers will be used for teaching purposes, and I don't want any of those computers to be able to access any private data on the rest of the network. However, there are certain areas that they need to have access to through a webbrowser.

Can this be done with Samba?
Thanks,

Martin