Function build_lease_break 

pub fn build_lease_break(
    key: [u8; 16],
    current: u32,
    new: u32,
    epoch: u16,
    flags: u32,
) -> Vec<u8> 

Build a LEASE_BREAK notification body ([MS-SMB2] §2.2.23.2): a 44-byte structure asking the holder of key to drop from current to new state.