The good one is:
Veeam support wrote:FT VMs in vsphere 6 are supported for snapshots.
To make it work, your VM must have the latest HW version and Fault Tolerance must be enabled using vsphere web client.
If it had been enabled in the previous version, you should disable it and enable again.
Please note that standalone C# client will NOT enable it properly, use web client.
Will try this...