lshw or lspci do not directly tell you which version of sata is supported. You need to check the shown chipset against its specification, which you'll have to google. As an example I use
lspci | grep -i sata
to find out which sata controller I have. The output is in my case
23:00:1f.2 SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller [AHCI mode] (rev 03)
This means I have either the ICH9M or the ICH9M-E controller. Googling for the former yielded a wikipedia article: http://en.wikipedia.org/wiki/List_of_Intel_chipsets telling me that it supports SATA 3.0 Gbit/s, hence SATA revision 2.0.