Print statements with subcircuits

Hello, I have a question regarding spectre netlist language

I know If I have a circuit containing MOSFETs, I can use a print statement to save specific parameter value to a file with the following statment:

print M0:vth,
+name = dc addto = "myfile.txt"

I wonder How can I use do the same If my mosfet now is defined inside subcircuit I? 

I see nothing about this in spectre help