+ - allow conditionalizing on factory reset boot, or on first boot.
+ - when cleaning up directories, take care of btrfs subvolumes too
+ (ID 927 gen 217573 top level 256 path var/tmp/.#test-btrfs4e8ef947c1122031
+ ID 928 gen 217573 top level 927 path var/tmp/.#test-btrfs4e8ef947c1122031/rec
+ ID 929 gen 217574 top level 928 path var/tmp/.#test-btrfs4e8ef947c1122031/rec/sv2
+ ID 930 gen 217575 top level 928 path var/tmp/.#test-btrfs4e8ef947c1122031/rec/sv3
+ ID 931 gen 217576 top level 930 path var/tmp/.#test-btrfs4e8ef947c1122031/rec/sv3/sub
+ ID 932 gen 217577 top level 928 path var/tmp/.#test-btrfs4e8ef947c1122031/rec/dir/sv4
+ ID 933 gen 217578 top level 932 path var/tmp/.#test-btrfs4e8ef947c1122031/rec/dir/sv4/dir/sv5)