What is maximum GNSS resolution?

AT+QGPSLOC=2 returns coordinates like: 28.59467 -81.20971
but GeoJSON standard accepts resolution up to 14 digits after comma
e.g: 28.594696039360965 -81.20827674865721 - which is good deal.

Is there way to get more precise coordinates from BG96 ?
I tried AT+QGPS= command with different parameters, <gnssmode> <fixmaxtime> <fixmaxdist> <fixcount><fixrate>

fixmaxdist - should have give more precise results, but this seems has no any effect of what AT+QGPSLOC=2 returns.