anchor.diff:  do_master_job(#tree_traverse{
       doc = Doc,
       traverse_info = TraverseInfo
  -}, _TaskID) ->
  +}, _MasterJobArgs) ->
       {ok, #{slave_jobs => [{Doc, TraverseInfo}], master_jobs => []}}.
   
   %%--------------------------------------------------------------------
  
positive.code:     execute_slave_on_dir = OnDir,
      batch_size = BatchSize,
      traverse_info = TraverseInfo
  } = TT, _TaskID) ->
      {ok, Children, ExtendedInfo} = case {Token, LN} of
          {undefined, <<>>} ->
              file_meta:list_children(Doc, BatchSize);
  
negative.code: %% returns jobs for listed children and next batch if needed.
  %% @end
  %%--------------------------------------------------------------------
  -spec do_master_job(master_job(), traverse:master_job_extended_args()) -> {ok, traverse:master_job_map()}.
  do_master_job(#tree_traverse{
      doc = #document{value = #file_meta{type = ?DIRECTORY_TYPE}} = Doc,
      token = Token,
  