accessing domain share from non domain computer

i have a shared folder on sbs 2000 server that i want to access from a non domain computer that is on the same physical network.if i map a drive to that share using a domain account i get access to the share but it also opens up the access to all the shares on 2000 server and the non domain user can see and access those shares by browsing the network.i want him to have access to that one particular share only and nothing else on the server. any ideas?