Will encrypting the Windows partition with BitLocker wipe out the macOS partition? I am running macOS and Windows on a macbook pro using bootcamp.

I have encrypted my macOS partition using FileVault.

I have read, that BitLocker on Windows on Mac would wipe the macOS partition. Is there any truth to that?

What is the best way to also encrypt the Windows partition?

I am running macOS sierra.
On a Mac, via BootCamp, BitLocker will only encrypt the Windows' system volume (drive C:). So MacOS will not be modified.

Of course, accessing your BitLocker encrypted volume when you are using your computer with MacOS is another matter. There are software doing this.