Command mount --rbind mounts recursively, which is handy, but umount has no recursive capabilities, so several umount commands are needed to unmount. The easiest way to do this is to look into /proc/mounts :
cat /proc/mounts
Even better:
cat /proc/mounts | awk '{print $2}'
Take a look and if you can grep needed mountpoints out of it, just add |grep <something> | sort -r | xargs umount to the above line.
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