set -x
cd "$FS_MOUNT_PATH"
-btrfs subvolume snapshot "$VOLUME_NAME" "$NEW_VOLUME_NAME"
+btrfs subvolume snapshot -r "$VOLUME_NAME" "$NEW_VOLUME_NAME"
find . -maxdepth 1 \( -name "$BASE_VOLUME_NAME" -o \
-name "$BASE_VOLUME_NAME"@'*' \) -exec ls -1d {} \; | sort | column