docs: public static boolean directoryContains(final File directory, final File child) {
          final File d = new File(normalize(directory.getAbsolutePath()));
          final File c = new File(normalize(child.getAbsolutePath()));
          if (d.equals(c)) {
              return false;
          } else {
              return c.getPath().startsWith(d.getPath());
          }
      }