It isn't possible to mount different volumes of a single server with a different user ID and password using AppleShare 3.0. This is a difficult approach using AppleShare 3.0, since it's possible for a physical volume to have multiple mounting points for users, and folders can be share points.
We suggest that users mount their "home folder" first. Then if they need access to a Guest folder on the same server they can easily add it to the existing mounted volume without logging off.
Another possibility is to make each "home folder" user owned. The other folders should have Guest access. When a person logs on as a registered user, they'll also have access to Guest folders.