I'm familiar with the Junkers. Nietzsche was born in Prussia. That's a fact. However, it is a rather facile understanding of Nietzsche and his thought to label him as proto-fascist or to label him as an avatar of the Nordic Nationalism that culminated in National Socialism.
I will not disagree that there have been those who have bastardized Nietzsche's thought for their own purposes, nefarious or otherwise. Nietzsche's own sister, Elizabeth, took Nietzsche's writings after his death and manipulated them for her own reasons, which included fomenting sympathy for German nationalist causes. This co-opting was where the persistent falsehood of his proto-fascism took root.
It is not Nietzsche's fault that lesser minds see identity between his thought and National Socialism. He is certainly one of the most misunderstood philosophers of recent memory. The "radical" nature of his ideas and the destruction that his thought rained on established modes of discourse has caused lesser minds to seek to pigeonhole him into a readily available historical template. The irony is, of course, that the very thrust of Nietzsche's life and thought was to dismantle and transform these historical templates so that new modes of thought and life could be erected in their place.
In other words, Nietzsche was not a proto-nazi. The Nordic history and tradition that culminated in National Socialism has its roots long before Nietzsche ever was born. Nietzsche, if anything, was the harshest critic of such fanatical, mindless zeal, a zeal that Nietzsche saw as being detrimental to the transformation of consciousness and the reevaluation of all values.