docs: def StatFS(self, path=None):
      """Call os.statvfs for a given list of rdf_paths.
  
      OS X and Linux only.
  
      Note that a statvfs call for a network filesystem (e.g. NFS) that is
      unavailable, e.g. due to no network, will result in the call blocking.
  
      Args:
        path: a Unicode string containing the path or None. If path is None the
          value in self.path is used.
  
      Returns:
        posix.statvfs_result object
      Raises:
        RuntimeError: if called on windows
      """
      if platform.system() == "Windows":
        raise RuntimeError("os.statvfs not available on Windows")
  
      local_path = client_utils.CanonicalPathToLocalPath(path or self.path)
  
      return os.statvfs(local_path)