Re: [PATCH v6 6/6] list-objects-filter: implement filter tree:0

diff --git a/list-objects-filter.c b/list-objects-filter.c
index a0ba78b20..8e3caf5bf 100644
--- a/list-objects-filter.c
+++ b/list-objects-filter.c

@@ -80,6 +80,55 @@ static void *filter_blobs_none__init(
        return d;
 }

+/*
+ * A filter for list-objects to omit ALL trees and blobs from the traversal.
+ * Can OPTIONALLY collect a list of the omitted OIDs.
+ */
+struct filter_trees_none_data {
+       struct oidset *omits;
+};
+
+static enum list_objects_filter_result filter_trees_none(
+       enum list_objects_filter_situation filter_situation,
+       struct object *obj,
+       const char *pathname,
+       const char *filename,
+       void *filter_data_)
+{
+       struct filter_trees_none_data *filter_data = filter_data_;
+
+       switch (filter_situation) {
+       default:
+               die("unknown filter_situation");