a nanometer is equivalent to .001 microns.
For those of us who have done our research a razor edge is somewhere between 2 and 4 microns.
so at it's thickest it would be 1/10th of a micron.
If the coating process wouldn't affect the edge of the blade, and the razor was extremely well honed, there might be a benefit. but when shaving the edge tends to bend on a microscopic level, and I doubt the coating would stop that.
Stropping would still be needed to align the teeth, and if the coating was brittle in any way, it would most likely loose it's effectiveness rather quickly.
worst case scenario when it cracked from flexing, it might take part of the edge with it, and the remaining coating could make honing a chalenge. :shrug:
I'd say try it, but not on anything expensive... maybe a Wapi.