Docker & OSX's guest Windows 10 Pro "doesn't have VT-X/AMD-v enabled. Enabling it in the BIOS is mandatory"
To enable nested virtualization in Parallels, do the following:

1) Shutdown the virtual machine

2) Open the configuration for the virtual machine

3) Click the "General" tab

4) Select either to auto-detect the OS, or explicitly select Windows 10

5) Click the "Hardware" tab and then click "CPU &amp; Memory" in the list on the left

6) Expand "Advanced settings" and tick the "Enable nested virtualization" option