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This works correctly on Python 3.4.
On Python 2.7, argparse seems to completely and silently ignore arguments in some conditions, for instance this setup will cause --verbose to be ignored on the main parser:
 options = argparse.ArgumentParser(add_help=False)
 options.add_argument('-v', '--verbose', action='store_true')
 parser = argparse.ArgumentParser(parents=[options])
 subparsers = parser.add_subparsers()
 parser_cmd = subparsers.add_parser('cmd', parents=[options])
Full runnable example here: http://paste.pound-python.org/show/XfVVhdJHSPISXLP1lASd/
Might or might not be related to #9351, workarounds welcome.