2009/174 VERY SHORT TIMEOUT smbfs mount permissions

[Gordon Ross]

> Also, why should dirperms default to 755 instead of 700?

They're not.  The default dirperms are derived from whatever
turns out to be the fileperms setting, plus X bits.  i.e.
if the user specifies fileperms=640, the default dirperms
will be 750.  If they don't specify either one, the default
dirperms will be 700.

Again, that part of the functionality is not changed by
this proposal.