Great, I have seen pistachio shell and fish scale myself. For such specimen either you can do usual coating (which I don't prefer) or you can use sub-kV SE imaging using FESEM.

Well, it really depends what do you want to do in the SEM, and which type of FE-SEM is available to you. But the vacuum should be your first concern (samples must be dried enough), and according to some random articles magnification for sole imaging of the fibres is rather low. As the fibres will most probably be very 3D, I would suggest some sort of rotation and tilting during carbon evaporation / gold sputtering, to overcome the shadowing effect during coating. Other that that - for better suggestions we would need to know about the purpose of the investigation and equipment available :-)

Here is the reference: Article Optimization of microwave irradiated - coconut shell activat...