You probably knew this already, and there's probably better solutions if you're not in the manual sysadmin world, but after I did that on a personal machine a few decades ago (I think it was?), I got in the habit of using `--one-file-system` when doing major recursive rm operations that weren't meant to cross filesystems. Or `find -xdev … -delete` for anything more selective.
It seems better to alias rm to "rm --one-file-system", assuming major cross-filesystem deletes aren't something you do all the time that should be made as ergonomic as possible.
