code: def does_unrtf_support_quiet() -> bool:
      
      required_unrtf_version = Version("0.21.9")
      # ... probably: http://hg.savannah.gnu.org/hgweb/unrtf/
      # ... 0.21.9 definitely supports --quiet
      # ... 0.19.3 definitely doesn't support it
      unrtf_filename = shutil.which('unrtf')
      if not unrtf_filename:
          return False
      p = subprocess.Popen(["unrtf", "--version"],
                           stdout=subprocess.PIPE,
                           stderr=subprocess.PIPE)
      _, err_bytes = p.communicate()
      text = err_bytes.decode(sys.getdefaultencoding())
      lines = text.split()
      if len(lines) < 1:
          return False
      version_str = lines[0]
      unrtf_version = Version(version_str)
      return unrtf_version >= required_unrtf_version
docs: The unrtf tool supports the '--quiet' argument from a version that I'm not
      quite sure of, where ``0.19.3 < version <= 0.21.9``. We check against
      0.21.9 here.