df command doesn't correctly report file system space utilization

[benhj]

An example output of df -h yields:

teasafe@osxfuse0 0Bi 0Bi 0Bi 100% 0 0 100% /testMount

Always.

[benhj]

Need to implement statfs function in FuseLayer.cpp

E.g.

int bb_statfs(const char *path, struct statvfs *statv)

[benhj]

Implemented. This should now be working although note that the number of reported free inodes is set to be equivalent to the number of free blocks.