Coefficients of Farrow structure?
The farrow structure effectively interpolates between different sets of filter coefficients, so if you need an adjustable delay ($\delta$) of, say, 0 to 1 samples, you need to create a number (K) of FIR filters covering that delay interval. The matlab command then creates a $ K-1^{th} $ order polynomial in $ \delta $ to represent each filter coefficient.

As Matt L said, if you don't need an adjustable delay, or to interpolate between filter coefficients based on some other parameter, there's no need for the farrow structure. If, however, you're just interested in how to get from FIR coefficients to farrow structure coefficients in general, I can post some rough code as I was messing about with this the other day. (hint: it's just simple least squares fitting).