argparse: Subparser with global argument where position does not matter

I'll explain the problem with an example. Suppose we have the following code for a random python program:

import argparse

parser = argparse.ArgumentParser(prog="webduino-generator",
                                     description="Webduino source builder")
# Global arguments
parser.add_argument("-v", "--verbose", 
                    action="store_true", dest='verbose',
                    help="Enable verbose output")

subparsers = parser.add_subparsers(dest="command")

parser_build = subparsers.add_parser("build", help="Build it")
parser_open = subparsers.add_parser("open", help="Open it")

# Check arguments
args = parser.parse_args()

Now with this parser, I can do -v open

which is great! However, I cannot do open -v

Also the parent/global argument -v will not be listed on the help page of the sub parser.

Is there a way to make this work and add it to the help page of the subparser?