docstr: Returns repo that the path falls in, using prefix.
  
  If the path is already tracked/collected, it just returns the repo.
  
  Otherwise, it collects the repos that might be in the path's parents
  and then returns the appropriate one.
code: def _get_repo(self, key: Key) -> "Repo":
      """Returns repo that the path falls in, using prefix.
  
      If the path is already tracked/collected, it just returns the repo.
  
      Otherwise, it collects the repos that might be in the path's parents
      and then returns the appropriate one.
      """
      repo = self._subrepos_trie.get(key)
      if repo:
          return repo
  
      prefix_key, repo = self._subrepos_trie.longest_prefix(key)
      dir_keys = (
          key[:i] for i in range(len(prefix_key) + 1, len(key) + 1)
      )
      self._update(dir_keys, starting_repo=repo)
      return self._subrepos_trie.get(key) or self.repo
  
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 19 for calling the _DVCFileSystem obj's underlying member method code with example usage: obj._get_repo(key) and returns: unknown, repo