How to firewall a router from network shares?

Unfortunately, computers in different workgroups can still see one another.

Unfortunately, even devices in separate workgroups can see one another, so that doesn't help. I did try, though.

(I just saw this on Page 2.)

Even if they can see each other no access to the files would be possible between machines in different workgroups. Although they shouldn't be able to even see each other at all if they are in different Workgroups but I'm not about to go down that rabbit hole.

Setting up a Guest wireless network is bog standard and beyond simple on every other router in the known universe other than the one you are using I suppose.

So it seems you are looking for an answer to a question that I have already answered.

>So it seems you are looking for an answer to a question that I have already answered.
I am on a computer in one workgroup viewing a computer on another workgroup, so that suggestion doesn't work. Homegroups don't achieve what my original request asked. Someone else suggested the Guest network, but, as I've described, that's not an option.

Thanks for giving it a shot, though.