Adjustment of parameters of function rcosine?

Endurance from Matlab help

(num = rcosine(Fd,Fs) designs a finite impulse response (FIR) raised
cosine filter and returns its transfer function. The digital input signal
has sampling frequency Fd. The sampling frequency for the filter is Fs.
The ratio Fs/Fd must be a positive integer greater than 1. )

1. What is Fs?, why Fs/Fd should be the whole? 
2. What is delay?
3. By what criteria it is necessary to choose Fs and delay? 

For example, at me is samples a signal with such frequency of
digitization, that on 1 symbol it is necessary 5.34068032595347 samples.
Rolloff factor 0.3. How to set in this case Fs and delay?