def umount(self, all=False, force=True):
<EOL>options = []<EOL>if force:<EOL><INDENT>options.append('<STR_LIT>')<EOL><DEDENT>if all:<EOL><INDENT>options.append('<STR_LIT>')<EOL><DEDENT>cmd = ["<STR_LIT>", "<STR_LIT>"] + options + [self.get_id() if not all else "<STR_LIT>"]<EOL>return run_cmd(cmd, return_output=True)<EOL>
unmount container filesystem
:param all: bool, option to unmount all mounted containers
:param force: bool, force the unmounting of specified containers' root file system
:return: str, the output from cmd