public function chgrp(int $group): vfsStreamContent
    {
        $this->group                 = $group;
        $this->lastAttributeModified = time();
        return $this;
    }
public function chgrp(int $group): vfsStreamContent
    {
        $this->group                 = $group;
        $this->lastAttributeModified = time();
        return $this;
    }
public function chgrp ( int $ group ) : vfsStreamContent { $ this -> group = $ group ; $ this -> lastAttributeModified = time ( ) ; return $ this ; }
change owner group of file to given group

@param   int  $group
@return  vfsStreamContent
change owner group of file to given group