Add note about missing Windows fields when backed by os.DirEntry.

Author: barneygale

Doc/library/pathlib.rst

@@ -1811,6 +1811,11 @@ Path information
       If *follow_symlinks* is ``False`` and this path is a symlink, return
       information about the symlink rather than its target.
 
+      On Windows, if the path was generated by scanning a directory, then the
+      ``st_ino``, ``st_dev`` and ``st_nlink`` attributes of the
+      :class:`~os.stat_result` are always set to zero. Call :meth:`Path.stat`
+      to get these attributes.
+
 
 .. _pathlib-pattern-language: