If you mean the ability to cut surgically at a specific frequency, it depends on the depth of the notch you use. And just to be clear, this is not with regard to the ‘Peak’ filters in Frequency, it is with regard to the ‘Notch’ filters, as chosen in the filter type menu of each band. These work surgically.
In the Frequency plug-in, set two filters to ‘Notch’ at the same frequency with Q at 14. If that’s not enough set three filters to notch at the same frequency. Using several notches on the same frequency gets you a deeper notch. You can easily test this using the signal generator set to a 60Hz sine (for example).
In apQualizr you’d need just a single band stop filter with around a quarter of an octave bandwidth.
These solutions will attenuate a 60Hz test sine from -12dBFS to around -80dBFS.
Or if you are talking about general low frequency cut then Cut 96 in the Frequency plug-in does a good job. Set at 85Hz this filter will cut a 60Hz sine test signal down from -12dBFS to -60dBFS… which IMO is a good result.