code: def readdir(self, path, fh):
      logger.info(f"readdir {path}")
      matched_path = self.match_path(path)
      if matched_path is None:
          return -errno.ENOENT
      logger.debug(f"matched {matched_path}")
      fnames = [
          k.encode("ascii", "replace") for k in matched_path.keys()
      ]
      fnames.extend((".", ".."))
      return [fuse.Direntry(f) for f in fnames]
  
imports: import errno
  import locale
  import logging
  import os
  import stat
  import sys
  import time
  from optparse import Option, OptionParser
  import nibabel
  import nibabel.dft
label_desc: Use image node_id 4 for calling the DICOMFS obj's underlying member method code with example usage: obj.readdir(path, fh) and returns: unknown, unknown