About timing precision of sdf file when simulation in ncsim

I find myncsim can only simualte the sdf file in precision of 10ps （round to 10ps）For exampe，This is a simple BUF sdf information:

1. (CELL
   
2. (CELLTYPE "BUFCLKHD30X")
   
3. (INSTANCE U10)
   
4. (DELAY
   
5. (ABSOLUTE
   
6. (IOPATH A Z (0.263:0.266:0.266) (0.257:0.259:0.259))
   
7. )
   
8. )
   
9. )

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When I observe the timing sequence in simvision window, I found the simulator will round it to 270p when Z transfering from 0 to 1 because of the changing of A.
In my sdf file the Timescale (unit) is 1 ns. And in my testbench is 1ns/1ps. And according the tools documentation from cadence, the default timing precision of sdf elaberating/compiling is 1fs. I think that means we do not need to set any precision relating compiler option (like sdf_precision 1ps) in ma case. (BTW, I have tried such complier option, but help nothing).
How can I watch/oberseve a delay of 266ps or say precision in 1ps from my simulation window? Mnay thanks.！My ncsim version is IES 2012, I thnik it was "latest" enough.
Many thanks.

what is timing precesion

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