Path path = tempDir.resolve("grandparent/parent/nonexistent.file");
    Path parent = path.getParent();
    Path grandparent = parent.getParent();
    assertFalse(Files.exists(grandparent));
    assertFalse(Files.exists(parent));

    MoreFiles.createParentDirectories(path);
    assertTrue(Files.exists(parent));
    assertTrue(Files.exists(grandparent));
  }