docs: private boolean directoryContains(File directory, IGroupMember member) {
          boolean found = false;
          if (member.isGroup()) {
              File memberFile = getFile((IEntityGroup) member);
              File[] files = directory.listFiles();
              for (int i = 0; i < files.length & !found; i++) {
                  found = files[i].equals(memberFile);
              }
          }
          return found;
      }