support recursive played filter

MediaBrowser.Controller/Entities/Folder.cs

@@ -1084,5 +1084,10 @@ namespace MediaBrowser.Controller.Entities
                 }
             });
         }
+
+        public override bool IsPlayed(User user)
+        {
+            return GetRecursiveChildren(user).Where(i => !i.IsFolder).All(i => i.IsPlayed(user));
+        }
     }
 }