Signed integer indicating the precision of the peer
clock, in seconds to the nearest power of two. The
value must be rounded to the next larger power of
two; for instance, a 50-Hz (20 ms) or 60-Hz
(16.67 ms) power-frequency clock would be assigned
the value -5 (31.25 ms), while a 1000-Hz (1 ms)
crystal-controlled clock would be assigned the value
-9 (1.95 ms).