protected FileSystem getAssociatedUserFilesystem() {
		if (domainFile instanceof GhidraFile) {
			return ((GhidraFile) domainFile).getUserFileSystem();
		}
		return null;
	}
Returns the hidden user-filesystem associated with this objects domain file, or null if
unknown.

@return user data file system
Ghidra/Framework/Project/src/main/java/ghidra/framework/data/DomainObjectAdapter.java