run debug with mount opts

[runzexia]

Thank you for writing this tool. I want to add a new function to mount the host's directory into debug container. Tools such as bcc tools need to mount the host directory to use。 ref https://github.com/iovisor/bcc/blob/c2e2a26b8624492018a14d5eebd4a50b869c911f/QUICKSTART.md#quick-start-guide

[chengfen1987]

It's a good idea to debug by bcc.

[johnmarcou]

You can browse via /proc:

cd /proc/1/root/