code: private void accountForIncludedDir(String name, File file, boolean fast) {
          processIncluded(name, file, dirsIncluded, dirsExcluded, dirsDeselected);
          if (fast && couldHoldIncluded(name) && !contentsExcluded(name)) {
              scandir(file, name + File.separator, fast);
          }
      }
docs: Process included directory.
  @param name path of the directory relative to the directory of
  the FileSet.
  @param file directory as File.
  @param fast whether to perform fast scans.