* Fix regression: correctly read mountinfo (close #445).
  * Fix regression: filter paths for "lsbtr" (action "ls").
  * Add "compat missing_otime" configuration option (close #393).
  * Add backend btrfs-progs-doas (close #444).
  * Allow directory traversal for local command line arguments.
  * Display all source subvolumes in "usage" action.
  * Handle errors from btrfs filesystem usage.