Cannot be used with "deepen", but can be used with
"deepen-since".
+If the 'filter' feature is advertised, the following argument can be
+included in the client's request:
+
+ filter <filter-spec>
+ Request that various objects from the packfile be omitted
+ using one of several filtering techniques. These are intended
+ for use with partial clone and partial fetch operations. See
+ `rev-list` for possible "filter-spec" values.
+
The response of `fetch` is broken into a number of sections separated by
delimiter packets (0001), with each section beginning with its section
header.