bcachefs: comment bch_subvolume

Signed-off-by: Kent Overstreet <[e-mail]>

fs/bcachefs/bcachefs_format.h

···
 	 * Snapshot subvolumes form a tree, separate from the snapshot nodes
 	 * tree - if this subvolume is a snapshot, this is the ID of the
 	 * subvolume it was created from:
+	 *
+	 * This is _not_ necessarily the subvolume of the directory containing
+	 * this subvolume:
 	 */
 	__le32			parent;
 	__le32			pad;