Counter Input >> Position >> A Input >> Digital Filter >> Enable

NI-DAQmx C Properties

Counter Input >> Position >> A Input >> Digital Filter >> Enable

Data Type: bool32
Description: Specifies whether to apply the pulse width filter to the signal.

You can get/set/reset this property using:
  DAQmxGetCIEncoderAInputDigFltrEnable
  DAQmxSetCIEncoderAInputDigFltrEnable
  DAQmxResetCIEncoderAInputDigFltrEnable