docstr: Keeps track of each and every path with the corresponding repo.
code: def _subrepos_trie(self):
      """Keeps track of each and every path with the corresponding repo."""
  
      from pygtrie import Trie
  
      trie = Trie()
      key = self._get_key(self.repo.root_dir)
      trie[key] = self.repo
      return trie
  
imports: import errno
  import functools
  import ntpath
  import os
  import posixpath
  import threading
  from collections import deque
  from contextlib import ExitStack, suppress
  from typing import TYPE_CHECKING, Any, Callable, Dict, Optional, Tuple, Type, Union
  from fsspec.spec import AbstractFileSystem
  from funcy import wrap_with
  from dvc.log import logger
  from dvc_objects.fs.base import FileSystem
  from .data import DataFileSystem
label_desc: Use image node_id 13 for calling the _DVCFileSystem obj's underlying member method code with example usage: obj._subrepos_trie() and returns: trie