code: def get_relative_modpath(module_fpath):
      
      modsubdir_list = get_module_subdir_list(module_fpath)
      _, ext = splitext(module_fpath)
      rel_modpath = join(*modsubdir_list) + ext
      rel_modpath = ensure_crossplat_path(rel_modpath)
      return rel_modpath
docs: Returns path to module relative to the package root
  
      Args:
          module_fpath (str): module filepath
  
      Returns:
          str: modname
  
      Example:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_path import *  # NOQA
          >>> import utool as ut
          >>> module_fpath = ut.util_path.__file__
          >>> rel_modpath = ut.get_relative_modpath(module_fpath)
          >>> rel_modpath = rel_modpath.replace('.pyc', '.py')  # allow pyc or py
          >>> result = ensure_crossplat_path(rel_modpath)
          >>> print(result)
          utool/util_path.py