Counter Input >> General Properties >> Counter Timebase >> Digital Filter >> Enable

NI-DAQmx C Properties

Counter Input >> General Properties >> Counter Timebase >> 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:
  DAQmxGetCICtrTimebaseDigFltrEnable
  DAQmxSetCICtrTimebaseDigFltrEnable
  DAQmxResetCICtrTimebaseDigFltrEnable