Windows – Disconnect from a network share

How do I really disconnect from a network share in Windows 8.1?

I'm familiar with using net use to disconnect from a network share, even if it isn't mapped to a network drive letter:

net use \\server\share /del

However, even after doing so, the folder may remain connected: if I quickly open Windows Explorer and go to \server\share, it connects immediately, without prompting me for a password, and I can do whatever file operations I want in that folder without it ever showing up again in net use's output.

If I use net use /del then leave things alone for 10-15 seconds, then the share appears to really disconnect, so that Windows Explorer prompts for password and takes time to reconnect and so on.

I'm not sure that this is a duplicate of this question; that makes it sound like net use sometimes fails, while my issue is that it appears to work but leaves connections open that it can't see.

Is there a way to really, truly close network share connections, besides net use? Is there a way to see what connections are open that net use isn't telling me about?

(This is using a Windows 8.1 Active Directory domain member as a client and a non-domain member Samba server.)