The current datasetProperties struct contains fields corresponding to every field returned by zfs in an nvlist. Looking at:

• http://docs.oracle.com/cd/E19253-01/819-5461/gazss/index.html
• https://www.freebsd.org/cgi/man.cgi?format=html&manpath=FreeBSD%208.1-RELEASE&query=zfs
  And searching the zfs code for mentions, it seems that there are properties not being returned. Properties like canmount and mounted. Figure out what's missing and why.