While I can appreciate the security advantages of snap packages, I can't help but resent the fact that the output of the mount command is now polluted with dozens of lines unrelated to mounted disks.
alias df='df -x squashfs'
Given that squashfs is a read-only filesystem, I don't know why this isn't done by default. No one needs to worry about how much free space is left on an ro volume.
I also go a few steps further and disable udev (-x devtmpfs) and tmpfs (-x tmpfs) as well.
findmnt --df --types