diff --git a/functions.sh b/functions.sh
index ef86ae2..2c9f55c 100755
--- a/functions.sh
+++ b/functions.sh
@@ -946,4 +946,9 @@ get_crtime() {
 #    return 0
 #}
 
+
+is_btrfs_subvolume() {
+    btrfs subvolume show "$1" >/dev/null 2>&1
+}
+
 #EOF