Yes NTP works in"mgmt vrf" . This is introduced in 6.1.0a. This feature allows restricting NTP control packets to management vrfalone which was not possible in the prior releases. So refer to the release notes for information about the support and is not there in config guide. Command is management-vrf; command under config ntp context this allows enable/disable of NTP on a management VRF
The following combination are supported.
Server/Client on default-vrf
Server/Client on management-vrf