public String getParentRegisterPath() {
		RegisterTree parentTree = getParent();
		if (parentTree == null || (parentTree.getRegister() == null)) {
			return null;
		}

		return parentTree.getRegisterPath();
	}
The parent path of this RegisterTree if it exists or null if this tree has no parent or
no parent with a register.
@return The parent path of this RegisterTree.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/RegisterTree.java