[Samba] disconnect users after a timeout period?

[Mark Rutherford]

We have an application that has a filed based database and we are having 
a problem
with users leaving their machines running.

Instead of going and looking at like 40 some machines, is there any way 
to drop them off?
or.. close the files they have open?
We need at least one machine logged in because it does processing on 
this database at night,
so we cannot have all machines logged out.

Is this possible?