code: def _get_key(self, path):
      parts = self.fs.relparts(path, self.root_dir)
      if parts == (os.curdir,):
          return ()
      return parts
  
imports: import os
  import re
  from collections import namedtuple
  from itertools import chain, groupby, takewhile
  from typing import TYPE_CHECKING, List, Optional
  from pathspec.patterns import GitWildMatchPattern
  from pathspec.util import normalize_file
  from pygtrie import Trie
  from dvc.fs import Schemes, localfs
  from dvc.log import logger
  from dvc.pathspec_math import PatternInfo, merge_patterns
label_desc: Use image node_id 2 for calling the DvcIgnoreFilter obj's underlying member method code with example usage: obj._get_key(path) and returns: parts, 