val parentFile = parentFile ?: return false
    if (parentFile == directory) return true
    return parentFile.isDescendentOf(directory)
  }

  /**
   * See FinalizationTester for discussion on how to best trigger GC in tests.
   * https://android.googlesource.com/platform/libcore/+/master/support/src/test/java/libcore/
   * java/lang/ref/FinalizationTester.java
   */
  @Throws(Exception::class)
  @JvmStatic