The file system on my tv won’t reveal much. But does that allow them to see everything on the home network?
Depends on if your home network is partitioned.
Generally the easiest way to do things is to have a cable modem (or whatever) a router for your computers and printers, and a separate router for all of the IOT devices that are so prevalent these days. That way the untrusted devices can only scan they’re own segment of the network. Sounds complicated, but these days people usually have an old router or two laying around to use.