Perhaps the following will do
root_line=$(awk '$1!~"^rootfs" && $2=="/" {print NR}' /proc/mounts)
skip_devices=$(head -n $root_line /proc/mounts | cut -d ' ' -f 1)
....
echo $skip_devices | grep -qs $DEV"$" && continue
--
umountfs must check whether a mountpoint contains a loopmounted root file
https://bugs.launchpad.net/bugs/151579
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