To add - when simplified sharing is enabled (the default), no security tab is visible in normal mode to set filestore security, and the sharing option is to either share read only access or full access for everyone. If you disable simplified sharing, the security tab becomes available, and you can also set permissions on the share (these are both operational, so you need to ensure both set to what you want). Also, as its a workgroup, you will need to set up 'mirror' accounts (so, if User A on Machine A wants access to Share B on Machine B, Machine B must have a user set up with same username/password as User A on Machine A. Then you set permissions for this 'mirror' a/c on Machine B and they automatically apply to User A on Machine A too).