The picture above shows several peaks on the surface of niobium (Nb, #41 on the periodic table, elemental metal) that were created using a Focused Ion Beam (FIB).
The peaks are approximately 1000 nanometers (1 micron) apart. An "average" human hair is approx. 50 - 60 microns in diameter (this depends on your source.....could be anywhere from 17 to 180 microns depending on color, temperature, and courseness).
The image was made using the electron beam in the dual-beam FIB system.
Most bacteria have diameters between 200 and 2000 nanometers (0.2 to 2 microns), as compared to my 1000 nm peak to peak.