### begin check if leaf is different, delete it if not ###
if [[ -e /a/opt/btrfs-snapshots-diff/btrfs-snapshots-diff.py ]]; then
+ source /a/bin/distro-functions/src/package-manager-abstractions
+ pi python-jmespath # dependency
parentid=$(btrfs sub show $leaf | awk '$1 == "Parent" && $2 == "UUID:" {print $3}')
bsubs=(/mnt/root/btrbk/$vol.*)
bsub=