How to determine from command line if NVMe slot is gen 3 or gen 4?

How to determine from command line if NVMe slot is gen 3 or gen 4? m 2 ssd slot nvme pcie gen3
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m2 expansion slot Synology SNV3400 series NVMe SSD drives can be installed through the built-in slots to enable SSD caching or create SSD storage pools Drives are sold

m2 sata slot For example, inserting a PCIe card on a PCIe slot will give you PCIe performance PCIe® Gen3 NVMe SSD · Sales Inquiry  2 SSDs These are usually dual-keyed with notches for both the B and M keys SATA only slots will usually use the B key