How get PCI express configuration for SSD storage?

I am looking for updating my SSD in my laptop to a newer/faster one. The one currently in the laptop is the default one that came with the purchase. It is an m.2 ssd.

The problem is that I am interested in how many lanes the SSD uses and which PCIe version. I tried different types of command, for example I tried most of the following link: http://www.binarytides.com/linux-commands-hardware-info/

They all give lots of information, but not the information that I need. Could somebody point me out a way to get this information?

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