Q: Airport 802.11r and 802.11k Roaming Support

Does anyone know if the Airport Extreme or the Airport Express support 802.11r / 802.11k / FT roaming? As of iOS 6.1 Apple apparently supports it on the client side (iOS: Wi-Fi network roaming with 802.11k and 802.11r), but I can't find any documentation to indicate if it is supported on the AP side. Aside from the hope that Apple is supporting 802.11r/k / FT, only Cisco and Aerohive (expensive) appear to definitively support it on the AP side.