BER performance of fractional equalizers for colored noise
Yes of course,  that's true. 

FS equalizer sample the signal in rate faster than Nyquist rate which provide more information about the signal. It's similar when you  increase the sampling frequency, you get better results. 

If you need to understand that idea, you can read about oversampling, fractional sampling, and if you are working on sparse channel read you compressive sending working method.