Go to vmware vm files:
cd /path/to/vagrant-vm/.vagrant/machines/default/vmware_fusion/some-random-string
Defragment vm disk:
/Applications/VMware\ Fusion.app/Contents/Library/vmware-vdiskmanager -d Virtual\ Disk.vmdk
Shrink vm disk:
/Applications/VMware\ Fusion.app/Contents/Library/vmware-vdiskmanager -k Virtual\ Disk.vmdk