strip hostname from dirname?

I need to get the full path of a file minus the hostname... anyone have an easy way to do this?

What I have is:
//ourhostname/ourfullpath/filename

What I need is:
/ourfullpath/filename

hostname evaluates to 'ourhostname'

dirname evaluates to '//ourhostname/ourfullpath'

basename evaluates to 'filename'

Thanks in advance.

Use sed:

sed 's%^//[^/]*%%'

thank you!