macOS High Sierra 10.13.2 'Your disk could not be partitioned'

Hello I have just bought a Mac Book Pro 2017 Touch bar and would like to install Windows 10 but every time it try to partition the drive it comes up with the error below. I have tried - Restart-Command S key -/sbin/fsck -fybut with no success.

I have read on various blogs, in order to resolve the issue a time machine back up is required and then to erase the contents of hard drive and reinstall??? I don't see why this should be necessary, as it is a brand new mac book? Please can any one help?