Although, there is no clicky way to pause a Windows servers shares, there is a bit more unconvenient way to prevent users from accessing your servers shares:

• Fire up a registry editor and navigate to HKLM\SYSTEM\CurrentControlSet\Services\LanmanServer\Shares
• Export all shares you want to reopen again later
• Delete all shares you want to pause and close the registry editor
• Restart the service called “Server“

et voila, you’re done.