Function vkGetDisplayPlaneSupportedDisplaysKHR 

pub unsafe extern "system" fn vkGetDisplayPlaneSupportedDisplaysKHR(
    physicalDevice: VkPhysicalDevice,
    planeIndex: u32,
    pDisplayCount: *mut u32,
    pDisplays: *mut VkDisplayKHR,
) -> VkResult

Available if built with prototypes.