The command fsstat (somehow a command relatively unknown when talking with customers) got a slight enhancement in an Solaris 11.4 SRU. Before this enhancement you were able to check for filesystem read/writes and what data is used via mmap.
However you couldn’t do it at the same time.
With this recent enhancement, there is now a single option to show both at the same time.
On a related note, there is now a -p for a parsable output.
As i use fsstat quite frequently in ad-hoc scripts this makes my life a little bit easier.