Prevent 'snapshot create' from Crossing Mountpoints

I don’t see it in the docs and if it’s there and I’m missing it, I apologize. But is there an option flag that prevents ‘snapshot create’ from crossing filesystem mountpoints in Linux/Unix?

You can set this per policy either global or per snapshot path.
kopia policy set --global --one-file-system=true

:man_facepalming: Thanks for pointing that out.