I have Workstation Pro 12.5.4 and Fusion 8.5.5 and each have one guest VM that is Windows 10 x64 Professional (both upgraded to W10 from W7 laptops that were converted to VMs).
Oddly enough, if the "Accelerate Graphics" is not checked in the display properties of the VMs, dxdiag reports a higher DX feature level support for the guest VMs.
I am not aware of any free and readily available software to test and verify the DX feature level properties other than dxdiag.
Driver Version: 8.15.1.50
(with Accelerate Graphics checked on both Workstation Pro and Fusion VMs)
DDI Version: 10
Feature Levels: 10_0,9_3,9_2,9_1
(with Accelerate Graphics unchecked on Workstation Pro VM)
DDI Version: 11.2
Feature Levels: 11_1,11_0,10_1,10_0,9_3,9_2,9_1
(with Accelerate Graphics unchecked on Fusion 8.5.5 VM)
DDI Version: 12
Feature Levels: 11_1,11_0,10_1,10_0,9_3,9_2,9_1
So two things you may want to do/check:
(1) you may want to make sure that "Accelerate Graphics" is checked in the Display properties of the VM.
(2) you may also want to check the actual feature level required for the software that you want to run as dxdiag reports 10_0 but there is a 10_1 feature level