id improved parent method

internal/types/id.go

@@ -52,17 +52,28 @@ func (i ID) Raw() interface{} {
 	return i
 }
 
-// Parent returns the parent dir ID.
+// Parent returns the parent dir ID. If its a file then return containing directory.
+// If this is a directory then return the dir one up.
 func (i ID) Parent() *ID {
 	if i.Key == "/" {
 		// Already at root. We dont have a parent
 		return nil
 	}
 
-	parent := &ID{
+	var parent *ID
+
+	if i.IsDirectory() {
+		parts := strings.Split(i.Key, "/")
+		parent = &ID{
+			Bucket: i.Bucket,
+			Key:    strings.Join(parts[:len(parts)-2], "/") + "/",
+		}
+	} else {
+		parent = &ID{
 			Bucket: i.Bucket,
 			Key:    filepath.Dir(i.Key) + "/",
 		}
+	}
 
 	parent.Normalize()