code: def nfs_unlink(pathlike, *, dir_fd=None):
      if dir_fd is None:
          path = Path(pathlike)
          deleted = path.with_name(".nfs00000000")
          path.rename(deleted)
      else:
          os.rename(
              pathlike,
              ".nfs1111111111",
              src_dir_fd=dir_fd,
              dst_dir_fd=dir_fd,
          )
  
imports: import os
  import time
  from pathlib import Path
  from unittest import mock, SkipTest
  import pytest
  from ...testing import TempFATFS
  from ...utils.filemanip import save_json, load_json, fname_presuffix, fnames_presuffix, hash_rename, check_forhash, _parse_mount_table, _cifs_table, on_cifs, copyfile, copyfiles, ensure_list, simplify_list, check_depends, split_filename, get_related_files, indirectory, loadpkl, loadcrash, savepkl, path_resolve, write_rst_list, emptydirs
label_desc: Use image node_id 31 for calling a global function with example usage: nfs_unlink(pathlike) without return types