Oo class for snapmirror relationships
    use NetApp::Filer;
    use NetApp::Snapmirror;
    my $filer   = NetApp::Filer->new( .... );
    my @snapmirrors     = $filer->get_snapmirrors;
    my $volume  = $filer->get_volume( .... );
    my @snapmirrors     = $volume->get_snapmirrors;
        This class encapsulates a single snapmirror relationship, and provides methods for querying information about it, as well as methods for managing it.
Returns the NetApp::Filer object for the filer on which this snapmirror relationship is defined.
Returns a NetApp::Snapmirror::Source object representing the source filer/volume for this snapmirror relationship.
Returns a NetApp::Snapmirror::Destination object representing the source filer/volume for this snapmirror relationship.
All of the following get methods return strings which match the values found for each of the obvious keywords in the output of \*(L"snapmirror status -l\*(R":
\s-1NOTE:\s0 In a future release, when snapshots are supported as a proper object, the return value of get_snapshot will almost certainly return such an object.