802.11 k/r/v support in wpa_supplicant

Hello,

Could I get some information about support of 802.11k/r/v standards is
wpa_supplicant?
* What part of 802.11k/r/v standards are implemented and since which
revision of wpa_supplicant?
* What is wpa_supplicant responsible for and what part of those
standards supplicant expects that nl80211/cfg80211 driver is
responsible for?
* Is 802.11r typically implemented in wpa supplicant or in driver level?
* Does supplicant takes into account 802.11r NeighborReport response
and/or 802.11v Load Balancing message from AP during roaming?
* May I ask your your opinion what advantage of those standards are
for not-mobile station i.e STB?

Thanks in advance for answering my questions.

BR,
Radek