ntpdig: no fraction of seconds

Dear Support Team,

I can't believe that my client is so precise that offset is zero microseconds using ntpdig.

# ntpdig 192.168.241.190 
2017-09-30 20:11:13.     0 (-0200) +0.000000 +/- 0.000000 192.168.241.190 s1 no-leap
# ntpdig 192.168.241.91 
2017-09-30 20:11:20.    0 (-0200) +0.000000 +/- 0.000002 192.168.241.91 s1 no-leap

Especially if I get a different result with ntpq.

# ntpq -pn 
     remote                                   refid      st t when poll reach   delay   offset   jitter
=======================================================================================================
*192.168.241.190                         .GPS.            1 u   16  128  377   0.8642   0.0543   1.3362
+192.168.241.91                          .PPS.            1 u  112  128  377   0.4281   0.0265   0.0605

My environemt:

GNU/Linux on ARM with 32 bit

gcc version 4.9.2 (Debian 4.9.2-10)

Python 2.7.9

ntpsec-0.9.7+1457 2017-09-30T11:58:21-0500

Kind regards
Hans