Question says it all: Does Hookmark support mounted network volumes?
Welcome to the Hookmark Forum , @iPanini . thanks for asking.
Please refer to " Control the
hook://file/ scope of searches used in (Advanced)" in Preferences Accessible from the Command-line – Hookmark for how to turn that on. It’s an esoteric preference you can turn on from the Terminal (command line) :
defaults write com.cogsciapps.hook hfile.url.search.scope network